If you don't want this kind of spam, shut off email access through your profile. Set it so only PM can be used. Also, NEVER EVER EVER post your email address anywhere on your profile, or on the forums, or anywhere else on the web on publicly accessible pages. The reason the OP and others are getting these is because you have your emails posted. A robot program is scraping the pages of WP looking for those. If you have it posted, I can guarantee you will sooner or later be spammed. And once they have it, it may never stop.
If you're already getting these, and hopefully it's on a free account, I highly recommend opening a new account, notifying everyone in your address book only to start using the new address, then once everyone in your contacts has responded to the new account, DELETE the old one permanently.
And quit posting your address on the web! 
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...